As for a loophole, how about "getting as much XP as you like, as long as you can pay for it" sound ?
How ?
Hire new minion (for up to 1/9 of best minion XP), transfer XP from new minion to highest XP minion, dismiss worthless minion, repeat as many times as you like.

Nope, it's all about sacrificing one benefit for another. If you want to strengthen one minion, you have to play without your normal tattoo. Otherwise, a lot of us would have a super-massive damage dealing minion.

And at larger levels, it'll take much, much longer than 24 hours to gain enough EXP to matter. You're out of luck there.

Money buys new minion -> exp transfered to bigger minion -> new minion fired -> buys a new one again.

Buy BA if you want more exp ;)

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<a href="/bboard/q-and-a-fetch-msg.tcl?msg_id=003434">EXP X-fer between Minions</a>